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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-58875] Implement missing optimizations for $set* expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-58875</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have observed two performance improvements for set related expression:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Use unordered sets instead of ordered sets&lt;/li&gt;
	&lt;li&gt;Cache constant sets to avoid the set building&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;These two optimizations have been implemented for $setIsSubset expression, but not for other expressions.&lt;/p&gt;

&lt;p&gt;One problem for porting these optimization to other set expression is using unordered sets causes the set element order being non deterministic. These can fail the fuzzer tests also may result in cascading non-deterministic expression values. (e.g. $group on $setIntersection). Note that this is not a problem for $setIsSubset expression since it&apos;s of boolean value. See related tickets &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58875&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-58875&lt;/a&gt;&#160;and &lt;a href=&quot;https://jira.mongodb.org/browse/TIG-3254&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/TIG-3254&lt;/a&gt;&#160;for some context.&lt;/p&gt;

&lt;p&gt;We have the following potential proposals:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Sort the set expression values before return to ensure a consistent order&lt;/li&gt;
	&lt;li&gt;Let the expression be non-deterministic, fix the fuzzer by either not generating set expressions or by other more complicated mechanisms.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1832161">SERVER-58875</key>
            <summary>Implement missing optimizations for $set* expressions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 27 Jul 2021 14:00:53 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:19 +0000</updated>
                            <resolved>Wed, 9 Feb 2022 18:59:19 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4345908" author="JIRAUSER1261330" created="Wed, 9 Feb 2022 19:00:37 +0000"  >&lt;p&gt;$setEquals also returns boolean so we have implemented all the optimizations for it.&lt;/p&gt;</comment>
                            <comment id="4345729" author="xgen-internal-githook" created="Wed, 9 Feb 2022 18:13:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;rui.liu@mongodb.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58875&quot; title=&quot;Implement missing optimizations for $set* expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58875&quot;&gt;&lt;del&gt;SERVER-58875&lt;/del&gt;&lt;/a&gt; Implement optimization for $setEquals expression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ac6279cbce409995b919917cff9187b683a817d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ac6279cbce409995b919917cff9187b683a817d&lt;/a&gt;&lt;/p&gt;</comment>
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